To propagate crocus, the best method is to divide established clumps of corms in the fall after the foliage has died back; simply dig up the corms, separate the smaller “offsets” (baby corms) from the parent corm, and replant them in a new location, discarding any damaged or diseased corms.
Key points about propagating crocus:
Division is the primary method: Crocus naturally multiply by producing smaller corms called offsets, so dividing existing clumps is the easiest way to propagate them.
When to divide: Dig up the corms in autumn, after the foliage has died down and the plant is dormant.
What to look for: When dividing, separate the smaller, healthy offsets from the larger parent corm.
Replanting: Plant the separated corms in a new location, ensuring they are planted at the correct depth with the pointed end facing upwards.